Stoking and combustion apparatus.



D. A. WOOD.

STOKING AND COMBUSTION APPARATUS. APPLICATION FILED FEB. 6,1918. 1,293,285.. r r I Patented Feb. 4, 1919.

3 SHEETS-SHEET i.

n. A. WOOD. STOKING AND COMBUSTION APPARATUS.

APPLICATION FHTED FEB. 6. 191a. Patented Feb. 4, 1919.

3 SHEETS-SHEET Z D. A. WOOD. STOKING AND COMBUSTION APPARATUS.

APPLICATION HLED FEB. 6. I918- Patented Beb.4,

3 SHEETS-SHEET 3- l jwvg 14 f at DAVID A. WOOD, F PITTSBURGH, PENNSYLVANIA.

STORING Alt'll CQMEUSTIOH APPARATUS.

r ,eeaess.

Application filed February 6,

- and Combustion Apparatus, of which the til) h It

in the claims.

following is a specification.

This invention relates to combined inechanical stoking and combustion mechanism, and has forone or" its objects to improve the construction and. produce a device whereby the combustible portions of the fuel may be economically and completely consumed and the generation of smoke prevented. 1

Another object of the invention is to provide a device of this character whereby the fuel is distributed over the entire grate surfaces in a continuous uniform layer during the operation of the apparatus, thereby equalizing the combustion and thoroughly consuming the combustible particles and preventing the generation of smoke.

Another object of the invention is to provide an apparatus wherein the fuel, such as bituminous coal, is first coked, or treated to extract and consume the smoke producing particles and the coked fuel used to pr0- duce the requisite heat to generate steam in any. suitable boiler or like generator, whereby formation and escape of smoke and like products of the combustion is efr'sectually prevented.

Another object of the invention is to provide a. device oithis character in which the parts are so arranged. that the portions exposed to the 'fuel are supplied with uniformly distributed air currents whereby abnormal or unequal heating of the exposed surfaces is prevented.

Another object of the invention is to proviola a cevice of this character wherein the strains uniformly distributed so that unequal weight and strain is obviated.

'Wit hese and other objects in view, the invent: 1 consists in certain novel features oi so: iction, as hereinafter shown and described and then specifically pointed out The iroved combustion and etching mechanism may he employed without ma terial structural change in different forms of furnaces or generators to produce heat Specification of Letters Patent.

Patented Feb. a, 191a. 1818. Serial No. 215,648.

sired to limit the invention 1n any manner in this respect, but-for the purpose or illustration the device is shown arranged in connection with a conventional steam generator of the water tube type, and in the drawings thus employed.

Figure 1 is a longitudinal vertical sectional elevation of the fire box portion of a steam generator with the improved apparatus arranged in connection therewith, the parts being 1n longitudinal section.

Fig. 2 is a plan view with the walls of the fire chamber and the coking portion in section on the line 2-2 of Fig. 1.

Fig. 3 is an enlarged sectional detail of the fuel feed controlling mechanism.

Fig. at is a section on the line H of Fig. 3.

Fig. 5 is an enlarged detail of one of the bracket devices for supporting the outer ends of the chain grate.

Fig. 6 is a detail view of the dump grate operating mechanism.

Fig. 7 is an end elevation with the generator and inclosing walls in section.

Fig. 8 is a transverse sectional view on the line 8-8 of Fig. 1 looking in the direction of the arrows.

Figs. 9 and 10 are details illustrating the construction of the feed plate operating mechanism.

The improved apparatus includes a fuel holding receptacle or hopper, an initial grate device and a preliminary combustion chamber in which the fuel is partly consumed, or cohed, a means for feeding the fuel from the receptacle to the initial grate device, a coking device to which the partly consumed or cokcd fuel is fed from the initial grate device, and a secondary grate device to which the-partly consumed fuel is transferred from the coking device and upon which the combustion is completed, the secondary grate device holding the fuel while the heat rising therefrom is utilized to generate the steam.

. The improved apparatus likewise includes a for receivm the noncombustible part use such as as es, clinkers, and the lilac, from which they are dune ed.

The initial grate device is prefera ly in the endless chain "form and upon which the for any required purpose, and it is not de- Eli fuel is received from the hopper and thence conducted after thepreliminary combustion or coking to the coking device. The secondcharge end.

are indicated at 11, the front wall at ary grate device is preferably of the rocking or shakingsfortn and disposed in downwardly inclined position toward the dis-- The inclosing side walls of the generator 12, the water tubes at 13 and the steam drum at 14. The ash pit is represented at 15 having a combined air intake and ash pit door 16. Formed-through the front 12 is an opening indicated at 18 'whichoccupies the usual lace of the fire door,-but is wider than tie orc'linary fire door and of less height.

Supported upon a suitable stand 19 in ad Vance of the front 12 of the generator is a preliminary combustion or coking chamber 20 linedwith suitable refractory material such as fire brick, and open at the lower side and beneath which the chain grate extends. The chain grate thus forms the bottom of the coking chamber.

The coking chamber is provided with a sleevelike projection 21 which fits into the opening-'18 of the generator and thus provides means for detachably coupling the coking chamber to the feed door of the generator.

The chain grate includes a' forward shaft mounted for rotation in suitable bear ings, indiciited at 28, attached to the inner faces of the sleeve 21 and carrying chain wheels 24 over which endless chains 25 opcrate, the chains supporting the grate bars represented at 26.

Mounted upon members of the stand 19 are bracket devices 27 having long'itudinally directed guidewaysor slots 28 in which bearing blocks 29 are movably mounted, each bracket being provided with an adjustin screw 30 whereby the blocks 29may be ad usted within tl'ieguideways. A shaft 31 is mounted for rotation in the bearing blocks 29 and is provided with chain pulleys 32 to carry the outer terminal of the chains The shaft 31 is thus disposed externally of the front of the coking chamber so that Supported upon the coking chamber 20 .by a sleeve 35 and also by an extension 36 from the brackets 27 is the fuel hopper rep- 1 the upper faceofthe plate t? a resented as a whole at Shand provided with i a discharge opening 38 registering with the coupling plate 35. A closure-plate or door 39 is associated with the hopper and adapt-- ed, when in its lowerposition, to close the opening 38 and to control the discharge of the fuel when adjusted. The closure rhenr ber 39 is provided with gear racks 40 with which pinions 41 on a shaft 42 engage, the shaft being mounted for rotation in bear lugs 43- attached to the feed hopper. By this means the closure 39 may be; adjusted to coi'itrol the size of the opening 38 by rotating the shaft 42. By this arrangement it'will be obvious that when the chain grate is actuated the fuel will be carried forward from the hopper in a layer of uniform thickness, covering the entire surface of the chain. rate, and within the lower part of the coking chamber.

A ratchet H iscarried by the shaft 42 and a stop pawl 45 is pivoted at 46 to the hopper 37, and operates to hold the shaft ahZ'and the controlling closure 39 in any adjusted position. v I

e lxtendingbetween the side Walls of the generator is a flat cokin plate 47, one edge of the plate being exten ed to a point below i the line of the shaft 22, so that the contents of the chain grate will be fed to the plate as the chain grate, is revolved.v Movably disposed within the sleeve 521 is another plate 48 resting by one edge upon the upper face ofjthe plate 47 and supported at its other edge upon suitable supportsSl attached to members of the stand 19. I By this arrangement the plate 48 is morable over will force the fuel deposited thereon fro h grate over its edge, as hereafte explained.-

A shaft 50 is supported suitablebrackets, one of which is shown t 51, from the stand 19 and provided wit ,cranks 52, the latter being connected by rods 53 to the member 48, the rotation of the slihftofl thus imparting reciprocatory memben-QSQ Mounted between the side walls of the fire box 15 are a plurality of shaking grates over which the ecked fuel discharged from the plate 47 by the operation of the plate. 48 will be fed. 'lheshaking grates are pref erably inclined toward the bridge wall por tion 17 of the generator, and likewise arranged in independently operating sets, two sets of the grate device being shown for illustration. The shaking grates may be arranged to be vibrated or shaken in any saitirs able manner, but for the purpose of illustration they are shown arranged to be vibrated. vertically at one end by a plurality of cam like devices. The grate sections are precisely alike and arran ed sidb by side, each section being indicated by the character 54. A shaft 55 is supported by bearings 56 y no movement to the each set of grates.

messes attached to the inner faces of the side walls of the fire box beneath the upper ends of Each ate section is provided with a bearing 5 mounted for rotation respectively upon the shafts 55, so that the grate sections may be oscillated at one end. upon the shafts as centers. Mounted for rotation of the fire box portion of the generator near the lower or free ends of the are other shafts 58 each sha t carrying a plurality of cam devices 59 adapted to engage the under faces of the ate sections near their free ends to cause them to swing upon their respective shafts 55 when the shafts 58 are rotated. Preferably the cam devices will be arranged to cause the grate sections to be vibrated or oscillated alternately to produce the requisite shaking action to the fuel passing thereover.

Any suitable means may be employed for actuating the chain grates, and shaker grates, u mechanism is illustrated for accomplishing the desired result, and comprising chain wheels 60 connected to the shafts 58 externally of the walls of the generator and over which a chain 61 operates, the latter leading over a chain wheel 62 on the extended end of the shaft 31.

- Mounted upon the shaft 31 is a drive ulley 63 to which a suitable motor is adapted to be applied. The motor is not illus-' trated as it forms no part of the present in vention.

Attached to the shaft 31 is a chain wheel 64 from which a chain 65 leads to another chain wheel 66 on the shaft 50, By this means the requisite motion is imparted to the crank shaft to operate the feed plate'48. The connhcting rods 53 are coupled to the cranks 52'by easily detachable devices illustratcd at 73 in Figs. 9 and 10, so that the coking chamber and its attachments includ ing the feed hopper, chain grate and the.

operating mechanism may be removed by simply disconnecting the couplings 73 and the main drive chain 61.

By this means the closure 74 of the front 12 of the generator is rendered readily accessible. a

Mounted for rotation upon a shaft 67 extending through the side walls of the ash pit 15 is a plate 68, adapted to receive the material passing over the shaker grate sections, said plate being mounted to rotate with the shaft 67 to enable the material to be dumped into the ash pit.

The shaft 67 is extended at one end and provided with an operating lever 69. Attached to the adjacent portion of the ash pit I5 is a segmental plate 70 having a plurality of notches 71 with which a pawl72 on the lcv'cr 69 engages to lock the dumping mcm' her 68 either in its horizontal position as through the side walls ate sections,

t an approved arrangement of,

shown by full lines in Fig. 1, or in a tilted position as shown by dotted lines, to enable the material to'be dumped therefrom.-

Having thus described the invention, what is claimed as new is;

1. In an apparatus of theclass described, a combustion chamber having an opening in the Wall thereof, a coking chamber provided with a tubular extension fitting within said opening,

a coking plate projectingwithin the combustion chamber, an endless grate operating within the coking chamber, a hopper for supplyin fuel to the endless grate,

and means for {6 coking plate into the combustion cham- 2. In an apparatus of the class described,

a combustion chamber having an opening in the wall thereof, a coking chamber having a tubular extension fittin within said open ing, an endless grate orming the bottom of the coking chamber, a hopper for supplying fuel to the endless grate,

ceding the material from a coking plate pro ecting within the combustion chamber,

plate into the combustion chamber.

' forming the bottom of 4. In an apparatus of the class described, a combustion chamber Having an opening in the wall thereof, a secondary grate arranged within the combustion chamber, a coking chamber having a tubular extension fitting within the opening in the wall of the combustion chamber, a primary grate disposed within the coking chamber, a hopper for feeding fuel to the primary grate, a coking plate disposed in advance of the primary grate and discharging into the combustion chamber above the secondary grate, and means for feedingthe material from the fcoking plate onto thesecondary grate.

5. In an apparatus-oithe, class described, a combustion chamber having an opening in the wall thereof, a coking chamber independent of the combustionchamber and provided with a tubulat portion extending within the opening in the wall of the combustion chamber, an endless. chain grate the coking chamber, a coking plate resting on the tubular portion of the coking chamber and projecting within the combustion chamber, a hopper and a reciprocating fitting within the openfor supplying fuel to the endless grate, means for regulating the quantity of fuel delivered from the hopper to the endless tubular portion extending Within the opening in the wallof the combustion chamber, an endless grate operating within the coking chamber and formin the bottom thereof, a hopper-for supp yin fuel to one end' of the endless grate, a ccfiring plate dis posed at the tubular portion of the coking chamber and projecting within the combustion chamber, a reciprocating plate movableover. thesurface of the coking plate, brackets secured to the coking chamber, a shaft journaled in the brackets and provided with a crank arm, and a pitman forming a connection between the crank arm and reciprocating plate.

7. In an apparatus of the class described, a combustion chamber having an'opening in the Wall thereof, a coking chamber having a tubular portion fitting within the opening of-the combustion chamber, there being an opening in the wall of the coking chamber at a point opposite the tubularportion, an endless grate operating within the coking chamber, ahopper disposed at the opening in the coking chamber for supplying fuel to the endless grate, means for regulating the quantity of fuel from the hopper, a coking plate seated Within the tubular portion of the coking chamber, and means for feeding material from the coking plate into the combustion chamber.

8. In an apparatus of the class described, a combustion chamber having an opening in the wall thereof, a coking oven having an opening registering with the opening in the wall of the combustion chamber, an end less grate operating within the coking oven, a secondary grate operating within 1 the combustion chamber, a. coking device located at the opening in the wall of the combustion chamber and having one end thereof projecting into said combustion chamber, means for feedlng fuel from the coking device onto the secondary grate, and means for simultaneously actuating the endless grate, secondary grate and feeding means.

opening registering with the opening in the Wall of said combustion chamber, a

tubular member forming a connection be tween the combustion chamber and coking chamber and fitting within said openings,

a primary grate arranged Within the coking chamber, means for feeding fuel to the for ward end of the primary grate, a coking de: vice disposed in advance of theflprimary grate and projecting within thecombustion chamber above the secondary grate, and means for feeding materialufronfi the coking device onto the secondary grate.

10. In an apparatus ,of the class described, a combustion chamber having an opening in one wall thereof, standards arranged 'exteriorly of the combustion chamber, a coking chamber supported on said standards and provided with an opening registering with the opening in the wall of the combustion chamber, a tubular member fitting within the openings and forming a source of communication between the coking chamber and combustion chamber, an endless grate operating within the coking chamber, a coking device projecting within the combustion chamber and adapted to receive material from the endless grate, a hopper'for delivering fuel to the endless grate, brackets secombustion chamber and provided with an oured to the standards, a feeding device ."movable over the surface of the coking device, a shaft journaled in the brackets and provided with a crank, a "rod forming a connection between the crank} and feeding device, a shaking grate disposed within the combustion chamber, and means for simultaneously actuating the chain grate, shaking grate and feeding device.

In testimony whereof I aiiix my signature.

DAVID A. W OOD. [n s.] 

